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arXiv math/0303133math.GRmath.GT
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CAT(0)2-配合物的顶点边界

Tits boundary of CAT(0) 2-complexes

Xiangdong Xie

摘要:

研究了局部紧CAT(0)2-复形的Tits边界.特别是,我们表明,远离端点,在山雀边界的测地线段是一个等距嵌入的欧几里得部门的理想边界。作为应用,我们给出了Tits边界上的两点是2-复形中测地线的端点以及由两个双曲等距线生成的群包含自由群的充分条件.我们还证明了如果两个CAT(0)2-复形是拟等距的,那么它们的Tits边界的核是双Lipschitz的.

英文摘要:

We investigate the Tits boundary of locally compact CAT(0) 2-complexes. In particular we show that away from the endpoints, a geodesic segment in the Tits boundary is the ideal boundary of an isometrically embedded Euclidean sector. As applications, we provide sufficient conditions for two points in the Tits boundary to be the endpoints of a geodesic in the 2-complex and for a group generated by two hyperbolic isometries to contain a free group. We also show that if two CAT(0) 2-complexes are quasi-isometric then the cores of their Tits boundaries are bi-Lipschitz.

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